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116results about How to "Freedom of choice" patented technology

Large power transformer self-adaptive active noise reduction control method and control system

The invention discloses a large power transformer self-adaptive active noise reduction control method. The method comprises the steps that a sensor collects primary noise as a reference signal and transmits the reference signal to a self-adaptive controller, and the self-adaptive controller outputs, according to the reference signal, a control signal to be used as a secondary signal so as to drive a loudspeaker to give out secondary noise; a primary sound field established by the noise made by a power transformer and a secondary sound field established by secondary noise made by the loudspeaker overlap, and an error sensor collects the overlapped sound pressure and forms an error signal; and the self-adaptive controller receives the error signal, and then adjusts, according to a preset objective function, the phase and amplitude of the secondary signal by use of a least mean square (LMS) algorithm for converging coefficient variation till the error signal satisfies the objective function and achieves a stable state. Through adoption of the method, while the steady state error performance is guaranteed, the converging speed of the algorithm is improved, and the noise reduction effect can be improved; and the initial value of the convergence coefficient can be selected more freely.
Owner:STATE GRID SHANDONG ELECTRIC POWER +1

Double-lens capsule endoscope with light guide device

ActiveCN107174188AExpand the field of viewAvoid stray light interferenceSurgeryEndoscopesLight guideFlexible circuits
The invention relates to a double-lens capsule endoscope with a light guide device. The double-lens capsule endoscope is characterized by comprising a capsule shell, a non-transparent shading body, a transparent light guide body, a front camera, a rear camera, a flexible circuit board, a lighting device, a permanent magnet, a radio-frequency signal transmission device, a signal processing device and a motion sensor, wherein the non-transparent shading body, the transparent light guide body, the front camera, the rear camera, the flexible circuit board, the lighting device, the permanent magnet, the radio-frequency signal transmission device, the signal processing device and the motion sensor are arranged in the capsule shell. A combined structure of two parts (the non-transparent shading body and the transparent light guide body) is adopted by the light guide device, so that the light guide effect can be strengthened, light only enters from the transparent light guide body, the non-transparent shading body is capable of shading one part of stray light entering lenses to increase the light guide effect, and meanwhile, the non-transparent shading body and the lenses are clung to the inner wall of a transparent optical dome to reduce the stray light to the maximal extent. In addition, by adopting a double-lens design matched with the light guide device, a shot image is clearer, and meanwhile, the limited space in a capsule is saved through the design of being clung to the inner wall.
Owner:安翰科技(武汉)股份有限公司

Combined machining system and method of ultrasonic vibration assisted grinding and magnetic polishing

InactiveCN109623504ARealize online automatic sharpeningImprove removal efficiencyWorking fluidMachined surface
The invention relates to a combined machining system and method of ultrasonic vibration assisted grinding and magnetic polishing. Ultrasonic vibration enables a diamond grinding wheel or workpiece toperform forced reciprocating vibration to enable suspended abrasive particles in working fluid to erode a machined surface and sharpen the surface of the grinding wheel. When the grinding wheel is outof the contact with the workpiece due to vibration and magnetorheological fluid flows through a gap between the grinding wheel and the workpiece, a magnetorheological effect occurs due to being subjected to the action of magnetic field force, an ''elastic polishing film'' is formed by rapid solidification, and hard abrasive particles contained in the magnetic fluid are evenly distributed on the surface of the ''elastic polishing film'', so that finishing process of the workpiece and sharpening of the grinding wheel are achieved. When regaining to be in contact with the workpiece due to vibration, the grinding wheel is directly involved in grinding the surface of the workpiece, and the forced reciprocating vibration of the grinding wheel enables frequent pulse cutting action to exist between the grinding wheel and the workpiece. According to the combined machining system and method of ultrasonic vibration assisted grinding and magnetic polishing, three technologies including ultrasonicmachining, grinding machining and magneto-fluid polishing are multi-combined, automatic on-line sharpening of the grinding wheel is realized, and high material removal rate and low damage surface quality are obtained.
Owner:ROCKET FORCE UNIV OF ENG

Method and apparatus for determining optimal route based on navigation map

The invention provides a method and an apparatus for determining the optimal route based on a navigation map. With the method and the apparatus of the present invention, the user can achieve greater freedom, the road restriction information can be prompted, the vehicle type factor can be considered, the user can select the passing-through road section end point order, and the optimal travel route can be obtained according to the user selection. The method comprises: 1, reading map data according to a navigation map access request; 2, receiving input navigation information; and 3, adopting the starting point of a travel as a reference point, determining the end point nearest to the starting point of the travel in the passing-through road section as a first end point, adopting the road section between the starting point and the first end point as a first road section, adopting another end point in the passing-through road section with the first end point existing as the new reference point, repeatedly performing the operations in the step 3 on the end points of other passing-through road sections, adopting the road section between another end point of the final passing-through road section and the ending point of the travel as the N-th road section, and connecting all the road sections and the passing-through road sections as the optimal route.
Owner:BEIJING JINGDONG SHANGKE INFORMATION TECH CO LTD +1

Ophthalmic examination and treatment system

An object of the present invention is to enable adequate and reliable system management in an ophthalmic examination and treatment system composed of wireless imaging devices mounted on various ophthalmic medical instruments used for ophthalmic examination and treatment and a display device for displaying the images captured by the imaging devices. The ophthalmic examination and treatment system 1 comprises a plurality of ophthalmic medical instruments 10, 20, 30 used in ophthalmic examination and treatment, wireless imaging devices 11, 21, 31 mounted on the respective ophthalmic medical instruments, and at least one display device 2 displaying the images captured with the imaging devices. Each imaging device comprises transmission/reception unit 12, 22, 23 for conducting transmission and reception of information data with the display device by wireless communication. Each transmission/reception unit has an inherent ID allocated correspondingly to each imaging device, transmits a data signal with an ID signal attached thereto to the transmission/reception unit 3 of the display device, and when an ID confirmation signal attached to a control signal from the transmission/reception unit of the display device and the own ID coincide, receives the control signal. The display device receives a data signal with an ID signal attached thereto from each imaging device, conducts displaying with the data signal corresponding to the ID and enables the remote control of the imaging device corresponding to the ID by attaching the ID signal and sending the control signal.
Owner:MAKINO OPHTALMIC INSTR

Distributed GNSS space division ciphering communication method

A distributed GNSS space division ciphering communication method is suitable for floor distributed communicating system based on GNSS, which is principally characterized in that before the data sending terminal DTE transmits the data, the self located communication zone according to the latitude and longitude information provided by the GNSS signals, and the cipher key corresponding to the zone is selected to cipher the transmission data. Because the zone cipher key has fixed length, the ciphering adopts a block cipher system. The sending terminal and receiving terminal DTE have a same region cipher key comparison table simultaneously, the receiving terminal DTE can search the region cipher key comparison table to obtain the decipher cipher key by recognizing the region number on the cipher text head section added by the sending terminal, and then uses the cipher key to decipher the cipher text and acquire the plaintext. The communication cipher key in the method dynamically changes with the variation of the located region of the sending terminal, which has free communication region partitioning dimension assisted with enrich and various encryption algorithms, thereby greatly improving ciphering flexibility, decoding-proof performance and tamper-proof performance.
Owner:SHANDONG UNIV

Terminal for performing bidirectional live sharing and intelligent monitoring and method thereof

The invention discloses a terminal for performing bidirectional live sharing and intelligent monitoring and a method thereof. The terminal comprises a camera, an audio acquisition unit, a displayer, a loudspeaker and a transceiver. The transceiver transmits videos and audios, which are respectively acquired by the camera and the audio acquisition unit, to a specific address in real time via a dedicated channel, receives the videos and the audios in real time from the specific address via the dedicated channel and outputs the videos and the audios via the displayer and the loudspeaker respectively, and the transceiver is responded to identification of a person or a specific person, or a specific motion, or an abnormal situation in the videos and the audios acquired by the camera and the audio acquisition unit respectively. The transceiver transmits prompt information to the specific address in real time. The dedicated channel is established in advance. The terminal is used for trusted fixed occasions. Compared with terminals in the prior art, user real-time communication experience is enhanced so that a user monitors the onsite situation of the specific occasion or the specific person in a more convenient and safer way.
Owner:SHANGHAI XIAODU TECHNOLOGY CO LTD

Method for preparing explosive composite pipe in local vacuum environment

PendingCN113231728AAvoid local defect problemsExplosive Freedom of ChoiceMetal working apparatusTubular articlesDetonatorTEX-explosive
The invention provides a method for preparing an explosive composite pipe in a local vacuum environment. The method comprises the following steps of: coaxially arranging a first to-be-composited pipe, a second to-be-composited pipe and a pvc pipe from inside to outside, and filling explosive and a detonator between the pvc pipe and the second to-be-composited pipe to form an explosive device of a to-be-welded pipe; sealing the two ends of a gap between the first to-be-composited pipe and the second to-be-composited pipe by using sealing strips, and vacuumizing to form a vacuum gap environment; and detonating the explosive device, and welding and combining the to-be-composited pipes by utilizing high pressure generated by explosion of the explosive to obtain the high-quality explosive composite pipe. According to the method for preparing the explosive composite pipe in the local vacuum environment, the phenomenon that in a traditional preparation method, large-area melting of a composite pipe bonding interface occurs due to the fact that gap air is not exhausted in time is effectively eradicated; the bonding strength of the explosive composite pipe is obviously improved; and compared with a traditional explosive welding method which needs to consider gap exhaust, the method has the advantage that the explosive velocity of the explosive can be selected more freely.
Owner:ANHUI UNIV OF SCI & TECH

Natural evaporation type humidifier

The present invention provides a natural evaporation type humidifier which, although small in size, has high humidifying performance. A sheet-like member (1) is provided with a water supply section (2) for supplying water to a humidifying section (3), and also with the humidifying section (3) for performing humidification by evaporating the water supplied from the water supply section (2). Because the water supply section (2) immersed in the water is folded up, that portion of the sheet-like member (1) which has a large area is compact in size, and this allows the portion to be immersed in water so as to function as the water supply section (2). That is, although compactly formed, that portion of the sheet-like member (1) which has the area which is relatively large can function as the water supply section (2), and as a result, the water supply section has high water supply performance. In contrast to the water supply section (2), the humidifying section (3) has an expanded shape, so that the humidifying section (3) has a sufficient area for evaporating the water. In addition, although compactly formed, the water supply section (2) can supply a sufficient amount of the water as described above. The structure enables the water supply section (2) to supply the water of an amount corresponding to the amount of evaporation of the water at the humidifying section (3) having the large area.
Owner:MIKUNI CORP
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